"proper range of" is a correct and usable phrase in written English.
You can use it to describe a range of things that are appropriate for a certain situation or context. For example, "We need to ensure that our employees have access to a proper range of tools and materials in order to do their jobs properly."
On average, 40percentt of would-be customers, whose computers are within proper range of a D.S.L.-equipped central telephone office, run into wiring complications.
And his playing had a proper range of weight and colour across the keyboard, bringing out the texture of the concerto's endlessly original writing.
The numbers studying a proper range of rigorous subjects has been in decline.
Design Expert Software was used to determine the proper range of these variables.
Through analysis we identify the proper range of these parameters, which we then verify by corresponding numerical tests.
Yet, as the lattice structure breaks down, the interplane distance between the silicene layers remains the same (within the proper range of lattice oscillations).
In this study, we found participants performed higher adequate depth (percentage of total within proper range) on Little Anne, while there was no difference in the adequate rate.
The cutting edge is designed to maintain proper ranges of rake angle and relief angle during deburring.
Twelve HFS-B items showed excellent fit (item responses were as expected), with proper ranges of infit values (0.64 1.28) and outfit values (0.67 1.09).
To use a proper range for each level, a hundred populations of gearboxes are considered.
Coherence, consistency and explanatory power therefore need to be maintained by establishing the proper range and scope of the theory and staying within it.
